/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.gateway.reactive.core.v4.endpoint.loadbalancer;

import io.gravitee.gateway.reactive.core.v4.endpoint.ManagedEndpoint;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author Guillaume LAMIRAND (guillaume.lamirand at graviteesource.com)
 * @author GraviteeSource Team
 */
public abstract class WeightedLoadBalancer extends AbstractLoadBalancerStrategy {

    AtomicReference<WeightDistributions> weightDistributions = new AtomicReference<>(new WeightDistributions());

    WeightedLoadBalancer(final List<ManagedEndpoint> endpoints) {
        super(endpoints);
    }

    @Override
    public void refresh() {
        List<WeightDistributions.WeightDistribution> computedDistribution = new ArrayList<>();

        int position = 0;
        for (ManagedEndpoint managedEndpoint : endpoints) {
            computedDistribution.add(new WeightDistributions.WeightDistribution(position++, managedEndpoint.getDefinition().getWeight()));
        }
        weightDistributions.set(new WeightDistributions(computedDistribution));
    }
}
